Smart Key Tracker: This Key Finder uses BT 4.0 technology to connect to Android, iOS, iPad, and other smartphones. See the distance of your lost car keys, luggage, wallet, dogs, or cats from you on the APP, so you can find them accurately. This 5-pack smart tracker locator includes black, green, blue, pink, and white. Easy to use: APP remote control. Download the free iSearching APP and pair it with your smartphone. When you press the remote control, the receiver beeps, and you can hear voices from the smart tracker within 30-49 feet. Remote Shutter: When the key tracker is connected to the mobile phone via Bluetooth, the lost device can be used as a remote control button to control the mobile phone's photo shutter, making it easy to capture beautiful moments. Ultra-low power consumption: The built-in CR2032 button battery is replaceable and easy to carry as a keychain on your child's school bag or hung on a pet collar. The real-time display location effectively prevents your children or pets from getting lost. Provides a last-seen pin-drop on the map via the APP to help you recover your items and search for your car in the parking lot.